Single-switch High Step-up DC-DC Research Articles

A Single Switch High Step-Up DC-DC Converter Based on Tri-Winding Coupled Inductor for Renewable Energy Applications

This article introduces a novel nonisolated single-switch high step-up DC-DC converter using a tri-winding coupled inductor (TWCL) for renewable energy applications such as PV systems. Also, the voltage multiplier cell (VMC) is used to attain a high voltage gain. The used VMC acts as a passive clamp circuit and reduces the voltage stress across the power switch. So, a low voltage-rated power switch can be used in the presented converter. The suggested topology uses only one power switch with low on-state resistance (RDS-ON), which leads to a simple control circuit and decreases the conduction losses. Highefficiency, operating with low duty cycle, low peak voltage over semiconductor elements, low turns ratio, the number of the coupled inductor, and high voltage conversion ratio are the significant benefits of the recommended DC-DC converter. To show the achievement of the presented structure, operational mode principles, steady-state, efficiency calculations, and comparison results are provided. Finally, a 120 W experimental prototype with 200 V output voltage and 50 kHz switching frequency is built to prove the usefulness of the suggested high step-up converter. The efficiency is measured 92.11% at rated power.

Analysis of Switching Frequency Characteristics of Single-switch High Step-up DC-DC Converter with Three-winding Coupled Inductor

Analysis of Switching Frequency Characteristics of Single-switch High Step-up DC-DC Converter with Three-winding Coupled Inductor

Single-Switch High Step-Up DC-DC Converter with a Resonant Voltage Doubler and low Duty Ratio

High voltage gain can be easily achieved by utilizing a coupled inductor, but high voltage stresses of switching devices can result from its leakage inductance. Hence, snubber circuits are required to alleviate voltage stresses but these can generally lead to power losses. In this paper, a single-switch high step-up DC-DC converter with a coupled inductor and low duty ratio is proposed. A resonant voltage doubler is integrated to obtain higher voltage gain. Zero-current-switching (ZCS) for the diodes in the voltage doubler is achieved by exploiting resonance of the leakage inductance. Additionally, there is no surge voltage in any of the switching device and this makes dissipative snubber circuits unnecessary. Furthermore, maximum voltage stresses of switching devices are much lower than the output voltage and high voltage gain with low duty ratio can be obtained due to the modified cascade boost structure. All this helps to improve overall power efficiency. The operational principle and characteristics of the proposed converter is provided in detail. Experimental investigation using an output 400V-140W prototype at an input 24V- 48V is conducted to verify its functionality.

A single switch high step-up DC-DC converter with three winding coupled inductor

A single switch high step-up DC-DC converter with three winding coupled inductor

Modelling and simulation of automatic controlled solar input single switch high step-up DC-DC converter with less duty ratio

Modelling and simulation of automatic controlled solar input single switch high step-up DC-DC converter with less duty ratio

Modelling and simulation of automatic controlled solar input single switch high step-up DC-DC converter with less duty ratio

In view of the advantages and disadvantages of present high step-up converters, a single switch high step-up converter is presented for the application of renewable energy source (RES) such as solar energy. This converter is predicated on the standard SEPIC converter, not just can acquire the SEPIC's point of interest that the continuous input current will compel directed EMI issues, additionally can accomplish high voltage pick up without extreme duty cycle and the peak voltage of semiconductor parts is lower than the output voltage. Proportional integral (PI) controller is proposed, and the overall performance of the system was analysed and compared with different load conditions to sift the operation of continuous conduction mode (CCM) and discontinuous conduction mode (DCM). This paper presents operation, design, mathematical analysis and simulation of a PV module fed DC-DC converter using PI controller in order to acquire the efficient operation of the system. The design aspects include selection of converter components, closed-loop parameters and their analysis. The simulations are carried out by using MATLAB/Simulink software and results are presented.

A Three-Phase AC-DC High Step-up Converter for Microscale Wind-power Generation Systems

In this paper, a three-phase AC-DC high step-up converter is developed for application to microscale wind-power generation systems. Such an AC-DC boost converter prossessess the property of the single-switch high step-up DC-DC structure. For power factor correction, the advanced half-stage converter is operated under the discontinuous conduction mode (DCM). Simulatanously, to achieve a high step-up voltage gain, the back half-stage functions in the continuous conduction mode (CCM). A high voltage gain can be obtained by use of an output-capacitor mass and a coupled inductor. Compared to the output voltage, the voltage stress is decreased on the switch. To lessen the conducting losses, a low rated voltage and small conductive resistance MOSFETs are adopted. In addition, the coupled inductor retrieves the leakage-inductor energy. The operation principle and steady-state behavior are analyzed, and a prototype hardware circuit is realized to verify the performance of the proposed converter.